. >> reporter: the pattern was repeated over and over, in virginia, maryland and even japan. it finally ended last year, when ricks was teaching at osbourne high in manassas. a parent saw his inappropriate facebook postings and contacted authorities. in a "washington post" interview, this mother said she was alarmed by e-mails ricks sent to her son's friend. but her warning to manassas school officials in 2008 weren't unheeded. >> after i read the messages, i realized, you know, it just wasn't -- there was -- there was something very, very wrong going on. >> reporter: after ricks gained his victims' trust, the crime was always the same. >> he would ply with liquor, tequila, beer, get them drunk, they would pass out. he would strip them, photograph them, fondle them, and commit other sex acts on them. >> reporter: the evidence collected, more than 600 photos on his computer, dozens of videotapes, and 28 journals ricks filled with graphic details of the assaults. as part of the plea deal, prosecutors also set a binding sentence of 300 months. that means the 50-year-old ricks wi